43 lines
1.4 KiB
Go
43 lines
1.4 KiB
Go
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package tracer
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import (
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"context"
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"gopkg.in/DataDog/dd-trace-go.v1/ddtrace"
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"gopkg.in/DataDog/dd-trace-go.v1/ddtrace/internal"
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)
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type contextKey struct{}
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var activeSpanKey = contextKey{}
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// ContextWithSpan returns a copy of the given context which includes the span s.
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func ContextWithSpan(ctx context.Context, s Span) context.Context {
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return context.WithValue(ctx, activeSpanKey, s)
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}
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// SpanFromContext returns the span contained in the given context. A second return
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// value indicates if a span was found in the context. If no span is found, a no-op
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// span is returned.
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func SpanFromContext(ctx context.Context) (Span, bool) {
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if ctx == nil {
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return &internal.NoopSpan{}, false
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}
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v := ctx.Value(activeSpanKey)
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if s, ok := v.(ddtrace.Span); ok {
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return s, true
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}
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return &internal.NoopSpan{}, false
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}
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// StartSpanFromContext returns a new span with the given operation name and options. If a span
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// is found in the context, it will be used as the parent of the resulting span. If the ChildOf
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// option is passed, the span from context will take precedence over it as the parent span.
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func StartSpanFromContext(ctx context.Context, operationName string, opts ...StartSpanOption) (Span, context.Context) {
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if s, ok := SpanFromContext(ctx); ok {
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opts = append(opts, ChildOf(s.Context()))
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}
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s := StartSpan(operationName, opts...)
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return s, ContextWithSpan(ctx, s)
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}
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